evening clothes vs formalwear

evening clothes and formalwear both are nouns.

Word	Noun	Adjective	Verb	Adverb
evening clothes	Yes	No	No	No
formalwear	Yes	No	No	No

As nouns, evening clothes and formalwear are synonyms defined as:

evening clothes and formalwear: attire to wear on formal occasions in the evening

Other synonyms of evening clothes include evening dress, eveningwear.

evening clothes (noun)	formalwear (noun)
attire to wear on formal occasions in the evening	attire to wear on formal occasions in the evening